microscale. i've used it and it works, the first tim i put it on the foil as suggested, but i found it was hard to get a thin and even coating. you also have to coat a larger piece than you need, which means you inevitably get adhesive on the foil already on the model - not a real prob as it cleans off lovely with iso alcohol, BUT when you peel the excess off it can lift the foil already on the model.
second time i put the glue on the model and found it much easier to use and control. you can get the glue thinner, only where you want it and you can get the almost unavoidable brushmarks to a bare minimum and even use them to get a panel variation by varying their direction. and if is not good enough you can just wipe it off and have another go. no waste.
I also advise geting a sheet of Bare Metal Foil. although i prefer the finish of normal foil, it is a bit more resilient to tearing for those really awkward bits.